#include <linux/firmware.h>
#include <linux/slab.h>
#include <linux/sched.h>
+#include <linux/file.h>
+#include <linux/list.h>
+#include <linux/async.h>
+#include <linux/pm.h>
+#include <linux/suspend.h>
+#include <linux/syscore_ops.h>
+
+#include <generated/utsrelease.h>
+
+#include "base.h"
MODULE_AUTHOR("Manuel Estrada Sainz");
MODULE_DESCRIPTION("Multi purpose firmware loading support");
MODULE_LICENSE("GPL");
+static const char *fw_path[] = {
+ "/lib/firmware/updates/" UTS_RELEASE,
+ "/lib/firmware/updates",
+ "/lib/firmware/" UTS_RELEASE,
+ "/lib/firmware"
+};
+
+/* Don't inline this: 'struct kstat' is biggish */
+static noinline long fw_file_size(struct file *file)
+{
+ struct kstat st;
+ if (vfs_getattr(file->f_path.mnt, file->f_path.dentry, &st))
+ return -1;
+ if (!S_ISREG(st.mode))
+ return -1;
+ if (st.size != (long)st.size)
+ return -1;
+ return st.size;
+}
+
+static bool fw_read_file_contents(struct file *file, struct firmware *fw)
+{
+ long size;
+ char *buf;
+
+ size = fw_file_size(file);
+ if (size < 0)
+ return false;
+ buf = vmalloc(size);
+ if (!buf)
+ return false;
+ if (kernel_read(file, 0, buf, size) != size) {
+ vfree(buf);
+ return false;
+ }
+ fw->data = buf;
+ fw->size = size;
+ return true;
+}
+
+static bool fw_get_filesystem_firmware(struct firmware *fw, const char *name)
+{
+ int i;
+ bool success = false;
+ char *path = __getname();
+
+ for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
+ struct file *file;
+ snprintf(path, PATH_MAX, "%s/%s", fw_path[i], name);
+
+ file = filp_open(path, O_RDONLY, 0);
+ if (IS_ERR(file))
+ continue;
+ success = fw_read_file_contents(file, fw);
+ fput(file);
+ if (success)
+ break;
+ }
+ __putname(path);
+ return success;
+}
+
/* Builtin firmware support */
#ifdef CONFIG_FW_LOADER
return loading_timeout > 0 ? loading_timeout * HZ : MAX_SCHEDULE_TIMEOUT;
}
-/* fw_lock could be moved to 'struct firmware_priv' but since it is just
- * guarding for corner cases a global lock should be OK */
-static DEFINE_MUTEX(fw_lock);
+struct firmware_cache {
+ /* firmware_buf instance will be added into the below list */
+ spinlock_t lock;
+ struct list_head head;
+ int state;
+
+#ifdef CONFIG_PM_SLEEP
+ /*
+ * Names of firmware images which have been cached successfully
+ * will be added into the below list so that device uncache
+ * helper can trace which firmware images have been cached
+ * before.
+ */
+ spinlock_t name_lock;
+ struct list_head fw_names;
+
+ wait_queue_head_t wait_queue;
+ int cnt;
+ struct delayed_work work;
+
+ struct notifier_block pm_notify;
+#endif
+};
-struct firmware_priv {
+struct firmware_buf {
+ struct kref ref;
+ struct list_head list;
struct completion completion;
- struct firmware *fw;
+ struct firmware_cache *fwc;
unsigned long status;
+ void *data;
+ size_t size;
struct page **pages;
int nr_pages;
int page_array_size;
+ char fw_id[];
+};
+
+struct fw_cache_entry {
+ struct list_head list;
+ char name[];
+};
+
+struct firmware_priv {
struct timer_list timeout;
- struct device dev;
bool nowait;
- char fw_id[];
+ struct device dev;
+ struct firmware_buf *buf;
+ struct firmware *fw;
+};
+
+struct fw_name_devm {
+ unsigned long magic;
+ char name[];
};
+#define to_fwbuf(d) container_of(d, struct firmware_buf, ref)
+
+#define FW_LOADER_NO_CACHE 0
+#define FW_LOADER_START_CACHE 1
+
+static int fw_cache_piggyback_on_request(const char *name);
+
+/* fw_lock could be moved to 'struct firmware_priv' but since it is just
+ * guarding for corner cases a global lock should be OK */
+static DEFINE_MUTEX(fw_lock);
+
+static struct firmware_cache fw_cache;
+
+static struct firmware_buf *__allocate_fw_buf(const char *fw_name,
+ struct firmware_cache *fwc)
+{
+ struct firmware_buf *buf;
+
+ buf = kzalloc(sizeof(*buf) + strlen(fw_name) + 1 , GFP_ATOMIC);
+
+ if (!buf)
+ return buf;
+
+ kref_init(&buf->ref);
+ strcpy(buf->fw_id, fw_name);
+ buf->fwc = fwc;
+ init_completion(&buf->completion);
+
+ pr_debug("%s: fw-%s buf=%p\n", __func__, fw_name, buf);
+
+ return buf;
+}
+
+static struct firmware_buf *__fw_lookup_buf(const char *fw_name)
+{
+ struct firmware_buf *tmp;
+ struct firmware_cache *fwc = &fw_cache;
+
+ list_for_each_entry(tmp, &fwc->head, list)
+ if (!strcmp(tmp->fw_id, fw_name))
+ return tmp;
+ return NULL;
+}
+
+static int fw_lookup_and_allocate_buf(const char *fw_name,
+ struct firmware_cache *fwc,
+ struct firmware_buf **buf)
+{
+ struct firmware_buf *tmp;
+
+ spin_lock(&fwc->lock);
+ tmp = __fw_lookup_buf(fw_name);
+ if (tmp) {
+ kref_get(&tmp->ref);
+ spin_unlock(&fwc->lock);
+ *buf = tmp;
+ return 1;
+ }
+ tmp = __allocate_fw_buf(fw_name, fwc);
+ if (tmp)
+ list_add(&tmp->list, &fwc->head);
+ spin_unlock(&fwc->lock);
+
+ *buf = tmp;
+
+ return tmp ? 0 : -ENOMEM;
+}
+
+static struct firmware_buf *fw_lookup_buf(const char *fw_name)
+{
+ struct firmware_buf *tmp;
+ struct firmware_cache *fwc = &fw_cache;
+
+ spin_lock(&fwc->lock);
+ tmp = __fw_lookup_buf(fw_name);
+ spin_unlock(&fwc->lock);
+
+ return tmp;
+}
+
+static void __fw_free_buf(struct kref *ref)
+{
+ struct firmware_buf *buf = to_fwbuf(ref);
+ struct firmware_cache *fwc = buf->fwc;
+ int i;
+
+ pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
+ __func__, buf->fw_id, buf, buf->data,
+ (unsigned int)buf->size);
+
+ spin_lock(&fwc->lock);
+ list_del(&buf->list);
+ spin_unlock(&fwc->lock);
+
+ vunmap(buf->data);
+ for (i = 0; i < buf->nr_pages; i++)
+ __free_page(buf->pages[i]);
+ kfree(buf->pages);
+ kfree(buf);
+}
+
+static void fw_free_buf(struct firmware_buf *buf)
+{
+ kref_put(&buf->ref, __fw_free_buf);
+}
+
static struct firmware_priv *to_firmware_priv(struct device *dev)
{
return container_of(dev, struct firmware_priv, dev);
static void fw_load_abort(struct firmware_priv *fw_priv)
{
- set_bit(FW_STATUS_ABORT, &fw_priv->status);
- wmb();
- complete(&fw_priv->completion);
+ struct firmware_buf *buf = fw_priv->buf;
+
+ set_bit(FW_STATUS_ABORT, &buf->status);
+ complete_all(&buf->completion);
}
static ssize_t firmware_timeout_show(struct class *class,
static void fw_dev_release(struct device *dev)
{
struct firmware_priv *fw_priv = to_firmware_priv(dev);
- int i;
- for (i = 0; i < fw_priv->nr_pages; i++)
- __free_page(fw_priv->pages[i]);
- kfree(fw_priv->pages);
kfree(fw_priv);
module_put(THIS_MODULE);
{
struct firmware_priv *fw_priv = to_firmware_priv(dev);
- if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->fw_id))
+ if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->buf->fw_id))
return -ENOMEM;
if (add_uevent_var(env, "TIMEOUT=%i", loading_timeout))
return -ENOMEM;
struct device_attribute *attr, char *buf)
{
struct firmware_priv *fw_priv = to_firmware_priv(dev);
- int loading = test_bit(FW_STATUS_LOADING, &fw_priv->status);
+ int loading = test_bit(FW_STATUS_LOADING, &fw_priv->buf->status);
return sprintf(buf, "%d\n", loading);
}
+/* firmware holds the ownership of pages */
static void firmware_free_data(const struct firmware *fw)
{
- int i;
- vunmap(fw->data);
- if (fw->pages) {
- for (i = 0; i < PFN_UP(fw->size); i++)
- __free_page(fw->pages[i]);
- kfree(fw->pages);
+ /* Loaded directly? */
+ if (!fw->priv) {
+ vfree(fw->data);
+ return;
}
+ fw_free_buf(fw->priv);
}
/* Some architectures don't have PAGE_KERNEL_RO */
#ifndef PAGE_KERNEL_RO
#define PAGE_KERNEL_RO PAGE_KERNEL
#endif
+
+/* one pages buffer should be mapped/unmapped only once */
+static int fw_map_pages_buf(struct firmware_buf *buf)
+{
+ if (buf->data)
+ vunmap(buf->data);
+ buf->data = vmap(buf->pages, buf->nr_pages, 0, PAGE_KERNEL_RO);
+ if (!buf->data)
+ return -ENOMEM;
+ return 0;
+}
+
/**
* firmware_loading_store - set value in the 'loading' control file
* @dev: device pointer
const char *buf, size_t count)
{
struct firmware_priv *fw_priv = to_firmware_priv(dev);
+ struct firmware_buf *fw_buf = fw_priv->buf;
int loading = simple_strtol(buf, NULL, 10);
int i;
mutex_lock(&fw_lock);
- if (!fw_priv->fw)
+ if (!fw_buf)
goto out;
switch (loading) {
case 1:
- firmware_free_data(fw_priv->fw);
- memset(fw_priv->fw, 0, sizeof(struct firmware));
- /* If the pages are not owned by 'struct firmware' */
- for (i = 0; i < fw_priv->nr_pages; i++)
- __free_page(fw_priv->pages[i]);
- kfree(fw_priv->pages);
- fw_priv->pages = NULL;
- fw_priv->page_array_size = 0;
- fw_priv->nr_pages = 0;
- set_bit(FW_STATUS_LOADING, &fw_priv->status);
+ /* discarding any previous partial load */
+ if (!test_bit(FW_STATUS_DONE, &fw_buf->status)) {
+ for (i = 0; i < fw_buf->nr_pages; i++)
+ __free_page(fw_buf->pages[i]);
+ kfree(fw_buf->pages);
+ fw_buf->pages = NULL;
+ fw_buf->page_array_size = 0;
+ fw_buf->nr_pages = 0;
+ set_bit(FW_STATUS_LOADING, &fw_buf->status);
+ }
break;
case 0:
- if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) {
- vunmap(fw_priv->fw->data);
- fw_priv->fw->data = vmap(fw_priv->pages,
- fw_priv->nr_pages,
- 0, PAGE_KERNEL_RO);
- if (!fw_priv->fw->data) {
- dev_err(dev, "%s: vmap() failed\n", __func__);
- goto err;
- }
- /* Pages are now owned by 'struct firmware' */
- fw_priv->fw->pages = fw_priv->pages;
- fw_priv->pages = NULL;
-
- fw_priv->page_array_size = 0;
- fw_priv->nr_pages = 0;
- complete(&fw_priv->completion);
- clear_bit(FW_STATUS_LOADING, &fw_priv->status);
+ if (test_bit(FW_STATUS_LOADING, &fw_buf->status)) {
+ set_bit(FW_STATUS_DONE, &fw_buf->status);
+ clear_bit(FW_STATUS_LOADING, &fw_buf->status);
+
+ /*
+ * Several loading requests may be pending on
+ * one same firmware buf, so let all requests
+ * see the mapped 'buf->data' once the loading
+ * is completed.
+ * */
+ fw_map_pages_buf(fw_buf);
+ complete_all(&fw_buf->completion);
break;
}
/* fallthrough */
dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
/* fallthrough */
case -1:
- err:
fw_load_abort(fw_priv);
break;
}
{
struct device *dev = kobj_to_dev(kobj);
struct firmware_priv *fw_priv = to_firmware_priv(dev);
- struct firmware *fw;
+ struct firmware_buf *buf;
ssize_t ret_count;
mutex_lock(&fw_lock);
- fw = fw_priv->fw;
- if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) {
+ buf = fw_priv->buf;
+ if (!buf || test_bit(FW_STATUS_DONE, &buf->status)) {
ret_count = -ENODEV;
goto out;
}
- if (offset > fw->size) {
+ if (offset > buf->size) {
ret_count = 0;
goto out;
}
- if (count > fw->size - offset)
- count = fw->size - offset;
+ if (count > buf->size - offset)
+ count = buf->size - offset;
ret_count = count;
int page_ofs = offset & (PAGE_SIZE-1);
int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
- page_data = kmap(fw_priv->pages[page_nr]);
+ page_data = kmap(buf->pages[page_nr]);
memcpy(buffer, page_data + page_ofs, page_cnt);
- kunmap(fw_priv->pages[page_nr]);
+ kunmap(buf->pages[page_nr]);
buffer += page_cnt;
offset += page_cnt;
count -= page_cnt;
static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size)
{
+ struct firmware_buf *buf = fw_priv->buf;
int pages_needed = ALIGN(min_size, PAGE_SIZE) >> PAGE_SHIFT;
/* If the array of pages is too small, grow it... */
- if (fw_priv->page_array_size < pages_needed) {
+ if (buf->page_array_size < pages_needed) {
int new_array_size = max(pages_needed,
- fw_priv->page_array_size * 2);
+ buf->page_array_size * 2);
struct page **new_pages;
new_pages = kmalloc(new_array_size * sizeof(void *),
fw_load_abort(fw_priv);
return -ENOMEM;
}
- memcpy(new_pages, fw_priv->pages,
- fw_priv->page_array_size * sizeof(void *));
- memset(&new_pages[fw_priv->page_array_size], 0, sizeof(void *) *
- (new_array_size - fw_priv->page_array_size));
- kfree(fw_priv->pages);
- fw_priv->pages = new_pages;
- fw_priv->page_array_size = new_array_size;
+ memcpy(new_pages, buf->pages,
+ buf->page_array_size * sizeof(void *));
+ memset(&new_pages[buf->page_array_size], 0, sizeof(void *) *
+ (new_array_size - buf->page_array_size));
+ kfree(buf->pages);
+ buf->pages = new_pages;
+ buf->page_array_size = new_array_size;
}
- while (fw_priv->nr_pages < pages_needed) {
- fw_priv->pages[fw_priv->nr_pages] =
+ while (buf->nr_pages < pages_needed) {
+ buf->pages[buf->nr_pages] =
alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
- if (!fw_priv->pages[fw_priv->nr_pages]) {
+ if (!buf->pages[buf->nr_pages]) {
fw_load_abort(fw_priv);
return -ENOMEM;
}
- fw_priv->nr_pages++;
+ buf->nr_pages++;
}
return 0;
}
{
struct device *dev = kobj_to_dev(kobj);
struct firmware_priv *fw_priv = to_firmware_priv(dev);
- struct firmware *fw;
+ struct firmware_buf *buf;
ssize_t retval;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
mutex_lock(&fw_lock);
- fw = fw_priv->fw;
- if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) {
+ buf = fw_priv->buf;
+ if (!buf || test_bit(FW_STATUS_DONE, &buf->status)) {
retval = -ENODEV;
goto out;
}
+
retval = fw_realloc_buffer(fw_priv, offset + count);
if (retval)
goto out;
int page_ofs = offset & (PAGE_SIZE - 1);
int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
- page_data = kmap(fw_priv->pages[page_nr]);
+ page_data = kmap(buf->pages[page_nr]);
memcpy(page_data + page_ofs, buffer, page_cnt);
- kunmap(fw_priv->pages[page_nr]);
+ kunmap(buf->pages[page_nr]);
buffer += page_cnt;
offset += page_cnt;
count -= page_cnt;
}
- fw->size = max_t(size_t, offset, fw->size);
+ buf->size = max_t(size_t, offset, buf->size);
out:
mutex_unlock(&fw_lock);
return retval;
struct firmware_priv *fw_priv;
struct device *f_dev;
- fw_priv = kzalloc(sizeof(*fw_priv) + strlen(fw_name) + 1 , GFP_KERNEL);
+ fw_priv = kzalloc(sizeof(*fw_priv), GFP_KERNEL);
if (!fw_priv) {
dev_err(device, "%s: kmalloc failed\n", __func__);
- return ERR_PTR(-ENOMEM);
+ fw_priv = ERR_PTR(-ENOMEM);
+ goto exit;
}
- fw_priv->fw = firmware;
fw_priv->nowait = nowait;
- strcpy(fw_priv->fw_id, fw_name);
- init_completion(&fw_priv->completion);
+ fw_priv->fw = firmware;
setup_timer(&fw_priv->timeout,
firmware_class_timeout, (u_long) fw_priv);
f_dev = &fw_priv->dev;
device_initialize(f_dev);
- dev_set_name(f_dev, "%s", dev_name(device));
+ dev_set_name(f_dev, "%s", fw_name);
f_dev->parent = device;
f_dev->class = &firmware_class;
-
+exit:
return fw_priv;
}
+/* store the pages buffer info firmware from buf */
+static void fw_set_page_data(struct firmware_buf *buf, struct firmware *fw)
+{
+ fw->priv = buf;
+ fw->pages = buf->pages;
+ fw->size = buf->size;
+ fw->data = buf->data;
+
+ pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
+ __func__, buf->fw_id, buf, buf->data,
+ (unsigned int)buf->size);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static void fw_name_devm_release(struct device *dev, void *res)
+{
+ struct fw_name_devm *fwn = res;
+
+ if (fwn->magic == (unsigned long)&fw_cache)
+ pr_debug("%s: fw_name-%s devm-%p released\n",
+ __func__, fwn->name, res);
+}
+
+static int fw_devm_match(struct device *dev, void *res,
+ void *match_data)
+{
+ struct fw_name_devm *fwn = res;
+
+ return (fwn->magic == (unsigned long)&fw_cache) &&
+ !strcmp(fwn->name, match_data);
+}
+
+static struct fw_name_devm *fw_find_devm_name(struct device *dev,
+ const char *name)
+{
+ struct fw_name_devm *fwn;
+
+ fwn = devres_find(dev, fw_name_devm_release,
+ fw_devm_match, (void *)name);
+ return fwn;
+}
+
+/* add firmware name into devres list */
+static int fw_add_devm_name(struct device *dev, const char *name)
+{
+ struct fw_name_devm *fwn;
+
+ fwn = fw_find_devm_name(dev, name);
+ if (fwn)
+ return 1;
+
+ fwn = devres_alloc(fw_name_devm_release, sizeof(struct fw_name_devm) +
+ strlen(name) + 1, GFP_KERNEL);
+ if (!fwn)
+ return -ENOMEM;
+
+ fwn->magic = (unsigned long)&fw_cache;
+ strcpy(fwn->name, name);
+ devres_add(dev, fwn);
+
+ return 0;
+}
+#else
+static int fw_add_devm_name(struct device *dev, const char *name)
+{
+ return 0;
+}
+#endif
+
+static void _request_firmware_cleanup(const struct firmware **firmware_p)
+{
+ release_firmware(*firmware_p);
+ *firmware_p = NULL;
+}
+
static struct firmware_priv *
_request_firmware_prepare(const struct firmware **firmware_p, const char *name,
struct device *device, bool uevent, bool nowait)
{
struct firmware *firmware;
- struct firmware_priv *fw_priv;
+ struct firmware_priv *fw_priv = NULL;
+ struct firmware_buf *buf;
+ int ret;
if (!firmware_p)
return ERR_PTR(-EINVAL);
return NULL;
}
- fw_priv = fw_create_instance(firmware, name, device, uevent, nowait);
- if (IS_ERR(fw_priv)) {
- release_firmware(firmware);
+ if (fw_get_filesystem_firmware(firmware, name)) {
+ dev_dbg(device, "firmware: direct-loading firmware %s\n", name);
+ return NULL;
+ }
+
+ ret = fw_lookup_and_allocate_buf(name, &fw_cache, &buf);
+ if (!ret)
+ fw_priv = fw_create_instance(firmware, name, device,
+ uevent, nowait);
+
+ if (IS_ERR(fw_priv) || ret < 0) {
+ kfree(firmware);
*firmware_p = NULL;
+ return ERR_PTR(-ENOMEM);
+ } else if (fw_priv) {
+ fw_priv->buf = buf;
+
+ /*
+ * bind with 'buf' now to avoid warning in failure path
+ * of requesting firmware.
+ */
+ firmware->priv = buf;
+ return fw_priv;
}
- return fw_priv;
-}
-static void _request_firmware_cleanup(const struct firmware **firmware_p)
-{
- release_firmware(*firmware_p);
- *firmware_p = NULL;
+ /* share the cached buf, which is inprogessing or completed */
+ check_status:
+ mutex_lock(&fw_lock);
+ if (test_bit(FW_STATUS_ABORT, &buf->status)) {
+ fw_priv = ERR_PTR(-ENOENT);
+ firmware->priv = buf;
+ _request_firmware_cleanup(firmware_p);
+ goto exit;
+ } else if (test_bit(FW_STATUS_DONE, &buf->status)) {
+ fw_priv = NULL;
+ fw_set_page_data(buf, firmware);
+ goto exit;
+ }
+ mutex_unlock(&fw_lock);
+ wait_for_completion(&buf->completion);
+ goto check_status;
+
+exit:
+ mutex_unlock(&fw_lock);
+ return fw_priv;
}
static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
{
int retval = 0;
struct device *f_dev = &fw_priv->dev;
+ struct firmware_buf *buf = fw_priv->buf;
+ struct firmware_cache *fwc = &fw_cache;
dev_set_uevent_suppress(f_dev, true);
if (uevent) {
dev_set_uevent_suppress(f_dev, false);
- dev_dbg(f_dev, "firmware: requesting %s\n", fw_priv->fw_id);
+ dev_dbg(f_dev, "firmware: requesting %s\n", buf->fw_id);
if (timeout != MAX_SCHEDULE_TIMEOUT)
mod_timer(&fw_priv->timeout,
round_jiffies_up(jiffies + timeout));
kobject_uevent(&fw_priv->dev.kobj, KOBJ_ADD);
}
- wait_for_completion(&fw_priv->completion);
+ wait_for_completion(&buf->completion);
- set_bit(FW_STATUS_DONE, &fw_priv->status);
del_timer_sync(&fw_priv->timeout);
mutex_lock(&fw_lock);
- if (!fw_priv->fw->size || test_bit(FW_STATUS_ABORT, &fw_priv->status))
+ if (!buf->size || test_bit(FW_STATUS_ABORT, &buf->status))
retval = -ENOENT;
- fw_priv->fw = NULL;
+
+ /*
+ * add firmware name into devres list so that we can auto cache
+ * and uncache firmware for device.
+ *
+ * f_dev->parent may has been deleted already, but the problem
+ * should be fixed in devres or driver core.
+ */
+ if (!retval && f_dev->parent)
+ fw_add_devm_name(f_dev->parent, buf->fw_id);
+
+ /*
+ * After caching firmware image is started, let it piggyback
+ * on request firmware.
+ */
+ if (!retval && fwc->state == FW_LOADER_START_CACHE) {
+ if (fw_cache_piggyback_on_request(buf->fw_id))
+ kref_get(&buf->ref);
+ }
+
+ /* pass the pages buffer to driver at the last minute */
+ fw_set_page_data(buf, fw_priv->fw);
+
+ fw_priv->buf = NULL;
mutex_unlock(&fw_lock);
device_remove_file(f_dev, &dev_attr_loading);
* @name will be used as $FIRMWARE in the uevent environment and
* should be distinctive enough not to be confused with any other
* firmware image for this or any other device.
+ *
+ * Caller must hold the reference count of @device.
**/
int
request_firmware(const struct firmware **firmware_p, const char *name,
out:
fw_work->cont(fw, fw_work->context);
+ put_device(fw_work->device);
module_put(fw_work->module);
kfree(fw_work);
* @cont: function will be called asynchronously when the firmware
* request is over.
*
- * Asynchronous variant of request_firmware() for user contexts where
- * it is not possible to sleep for long time. It can't be called
- * in atomic contexts.
+ * Caller must hold the reference count of @device.
+ *
+ * Asynchronous variant of request_firmware() for user contexts:
+ * - sleep for as small periods as possible since it may
+ * increase kernel boot time of built-in device drivers
+ * requesting firmware in their ->probe() methods, if
+ * @gfp is GFP_KERNEL.
+ *
+ * - can't sleep at all if @gfp is GFP_ATOMIC.
**/
int
request_firmware_nowait(
return -EFAULT;
}
+ get_device(fw_work->device);
INIT_WORK(&fw_work->work, request_firmware_work_func);
schedule_work(&fw_work->work);
return 0;
}
+/**
+ * cache_firmware - cache one firmware image in kernel memory space
+ * @fw_name: the firmware image name
+ *
+ * Cache firmware in kernel memory so that drivers can use it when
+ * system isn't ready for them to request firmware image from userspace.
+ * Once it returns successfully, driver can use request_firmware or its
+ * nowait version to get the cached firmware without any interacting
+ * with userspace
+ *
+ * Return 0 if the firmware image has been cached successfully
+ * Return !0 otherwise
+ *
+ */
+int cache_firmware(const char *fw_name)
+{
+ int ret;
+ const struct firmware *fw;
+
+ pr_debug("%s: %s\n", __func__, fw_name);
+
+ ret = request_firmware(&fw, fw_name, NULL);
+ if (!ret)
+ kfree(fw);
+
+ pr_debug("%s: %s ret=%d\n", __func__, fw_name, ret);
+
+ return ret;
+}
+
+/**
+ * uncache_firmware - remove one cached firmware image
+ * @fw_name: the firmware image name
+ *
+ * Uncache one firmware image which has been cached successfully
+ * before.
+ *
+ * Return 0 if the firmware cache has been removed successfully
+ * Return !0 otherwise
+ *
+ */
+int uncache_firmware(const char *fw_name)
+{
+ struct firmware_buf *buf;
+ struct firmware fw;
+
+ pr_debug("%s: %s\n", __func__, fw_name);
+
+ if (fw_get_builtin_firmware(&fw, fw_name))
+ return 0;
+
+ buf = fw_lookup_buf(fw_name);
+ if (buf) {
+ fw_free_buf(buf);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static struct fw_cache_entry *alloc_fw_cache_entry(const char *name)
+{
+ struct fw_cache_entry *fce;
+
+ fce = kzalloc(sizeof(*fce) + strlen(name) + 1, GFP_ATOMIC);
+ if (!fce)
+ goto exit;
+
+ strcpy(fce->name, name);
+exit:
+ return fce;
+}
+
+static int __fw_entry_found(const char *name)
+{
+ struct firmware_cache *fwc = &fw_cache;
+ struct fw_cache_entry *fce;
+
+ list_for_each_entry(fce, &fwc->fw_names, list) {
+ if (!strcmp(fce->name, name))
+ return 1;
+ }
+ return 0;
+}
+
+static int fw_cache_piggyback_on_request(const char *name)
+{
+ struct firmware_cache *fwc = &fw_cache;
+ struct fw_cache_entry *fce;
+ int ret = 0;
+
+ spin_lock(&fwc->name_lock);
+ if (__fw_entry_found(name))
+ goto found;
+
+ fce = alloc_fw_cache_entry(name);
+ if (fce) {
+ ret = 1;
+ list_add(&fce->list, &fwc->fw_names);
+ pr_debug("%s: fw: %s\n", __func__, name);
+ }
+found:
+ spin_unlock(&fwc->name_lock);
+ return ret;
+}
+
+static void free_fw_cache_entry(struct fw_cache_entry *fce)
+{
+ kfree(fce);
+}
+
+static void __async_dev_cache_fw_image(void *fw_entry,
+ async_cookie_t cookie)
+{
+ struct fw_cache_entry *fce = fw_entry;
+ struct firmware_cache *fwc = &fw_cache;
+ int ret;
+
+ ret = cache_firmware(fce->name);
+ if (ret) {
+ spin_lock(&fwc->name_lock);
+ list_del(&fce->list);
+ spin_unlock(&fwc->name_lock);
+
+ free_fw_cache_entry(fce);
+ }
+
+ spin_lock(&fwc->name_lock);
+ fwc->cnt--;
+ spin_unlock(&fwc->name_lock);
+
+ wake_up(&fwc->wait_queue);
+}
+
+/* called with dev->devres_lock held */
+static void dev_create_fw_entry(struct device *dev, void *res,
+ void *data)
+{
+ struct fw_name_devm *fwn = res;
+ const char *fw_name = fwn->name;
+ struct list_head *head = data;
+ struct fw_cache_entry *fce;
+
+ fce = alloc_fw_cache_entry(fw_name);
+ if (fce)
+ list_add(&fce->list, head);
+}
+
+static int devm_name_match(struct device *dev, void *res,
+ void *match_data)
+{
+ struct fw_name_devm *fwn = res;
+ return (fwn->magic == (unsigned long)match_data);
+}
+
+static void dev_cache_fw_image(struct device *dev, void *data)
+{
+ LIST_HEAD(todo);
+ struct fw_cache_entry *fce;
+ struct fw_cache_entry *fce_next;
+ struct firmware_cache *fwc = &fw_cache;
+
+ devres_for_each_res(dev, fw_name_devm_release,
+ devm_name_match, &fw_cache,
+ dev_create_fw_entry, &todo);
+
+ list_for_each_entry_safe(fce, fce_next, &todo, list) {
+ list_del(&fce->list);
+
+ spin_lock(&fwc->name_lock);
+ /* only one cache entry for one firmware */
+ if (!__fw_entry_found(fce->name)) {
+ fwc->cnt++;
+ list_add(&fce->list, &fwc->fw_names);
+ } else {
+ free_fw_cache_entry(fce);
+ fce = NULL;
+ }
+ spin_unlock(&fwc->name_lock);
+
+ if (fce)
+ async_schedule(__async_dev_cache_fw_image,
+ (void *)fce);
+ }
+}
+
+static void __device_uncache_fw_images(void)
+{
+ struct firmware_cache *fwc = &fw_cache;
+ struct fw_cache_entry *fce;
+
+ spin_lock(&fwc->name_lock);
+ while (!list_empty(&fwc->fw_names)) {
+ fce = list_entry(fwc->fw_names.next,
+ struct fw_cache_entry, list);
+ list_del(&fce->list);
+ spin_unlock(&fwc->name_lock);
+
+ uncache_firmware(fce->name);
+ free_fw_cache_entry(fce);
+
+ spin_lock(&fwc->name_lock);
+ }
+ spin_unlock(&fwc->name_lock);
+}
+
+/**
+ * device_cache_fw_images - cache devices' firmware
+ *
+ * If one device called request_firmware or its nowait version
+ * successfully before, the firmware names are recored into the
+ * device's devres link list, so device_cache_fw_images can call
+ * cache_firmware() to cache these firmwares for the device,
+ * then the device driver can load its firmwares easily at
+ * time when system is not ready to complete loading firmware.
+ */
+static void device_cache_fw_images(void)
+{
+ struct firmware_cache *fwc = &fw_cache;
+ int old_timeout;
+ DEFINE_WAIT(wait);
+
+ pr_debug("%s\n", __func__);
+
+ /* cancel uncache work */
+ cancel_delayed_work_sync(&fwc->work);
+
+ /*
+ * use small loading timeout for caching devices' firmware
+ * because all these firmware images have been loaded
+ * successfully at lease once, also system is ready for
+ * completing firmware loading now. The maximum size of
+ * firmware in current distributions is about 2M bytes,
+ * so 10 secs should be enough.
+ */
+ old_timeout = loading_timeout;
+ loading_timeout = 10;
+
+ mutex_lock(&fw_lock);
+ fwc->state = FW_LOADER_START_CACHE;
+ dpm_for_each_dev(NULL, dev_cache_fw_image);
+ mutex_unlock(&fw_lock);
+
+ /* wait for completion of caching firmware for all devices */
+ spin_lock(&fwc->name_lock);
+ for (;;) {
+ prepare_to_wait(&fwc->wait_queue, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (!fwc->cnt)
+ break;
+
+ spin_unlock(&fwc->name_lock);
+
+ schedule();
+
+ spin_lock(&fwc->name_lock);
+ }
+ spin_unlock(&fwc->name_lock);
+ finish_wait(&fwc->wait_queue, &wait);
+
+ loading_timeout = old_timeout;
+}
+
+/**
+ * device_uncache_fw_images - uncache devices' firmware
+ *
+ * uncache all firmwares which have been cached successfully
+ * by device_uncache_fw_images earlier
+ */
+static void device_uncache_fw_images(void)
+{
+ pr_debug("%s\n", __func__);
+ __device_uncache_fw_images();
+}
+
+static void device_uncache_fw_images_work(struct work_struct *work)
+{
+ device_uncache_fw_images();
+}
+
+/**
+ * device_uncache_fw_images_delay - uncache devices firmwares
+ * @delay: number of milliseconds to delay uncache device firmwares
+ *
+ * uncache all devices's firmwares which has been cached successfully
+ * by device_cache_fw_images after @delay milliseconds.
+ */
+static void device_uncache_fw_images_delay(unsigned long delay)
+{
+ schedule_delayed_work(&fw_cache.work,
+ msecs_to_jiffies(delay));
+}
+
+static int fw_pm_notify(struct notifier_block *notify_block,
+ unsigned long mode, void *unused)
+{
+ switch (mode) {
+ case PM_HIBERNATION_PREPARE:
+ case PM_SUSPEND_PREPARE:
+ device_cache_fw_images();
+ break;
+
+ case PM_POST_SUSPEND:
+ case PM_POST_HIBERNATION:
+ case PM_POST_RESTORE:
+ /*
+ * In case that system sleep failed and syscore_suspend is
+ * not called.
+ */
+ mutex_lock(&fw_lock);
+ fw_cache.state = FW_LOADER_NO_CACHE;
+ mutex_unlock(&fw_lock);
+
+ device_uncache_fw_images_delay(10 * MSEC_PER_SEC);
+ break;
+ }
+
+ return 0;
+}
+
+/* stop caching firmware once syscore_suspend is reached */
+static int fw_suspend(void)
+{
+ fw_cache.state = FW_LOADER_NO_CACHE;
+ return 0;
+}
+
+static struct syscore_ops fw_syscore_ops = {
+ .suspend = fw_suspend,
+};
+#else
+static int fw_cache_piggyback_on_request(const char *name)
+{
+ return 0;
+}
+#endif
+
+static void __init fw_cache_init(void)
+{
+ spin_lock_init(&fw_cache.lock);
+ INIT_LIST_HEAD(&fw_cache.head);
+ fw_cache.state = FW_LOADER_NO_CACHE;
+
+#ifdef CONFIG_PM_SLEEP
+ spin_lock_init(&fw_cache.name_lock);
+ INIT_LIST_HEAD(&fw_cache.fw_names);
+ fw_cache.cnt = 0;
+
+ init_waitqueue_head(&fw_cache.wait_queue);
+ INIT_DELAYED_WORK(&fw_cache.work,
+ device_uncache_fw_images_work);
+
+ fw_cache.pm_notify.notifier_call = fw_pm_notify;
+ register_pm_notifier(&fw_cache.pm_notify);
+
+ register_syscore_ops(&fw_syscore_ops);
+#endif
+}
+
static int __init firmware_class_init(void)
{
+ fw_cache_init();
return class_register(&firmware_class);
}
static void __exit firmware_class_exit(void)
{
+#ifdef CONFIG_PM_SLEEP
+ unregister_syscore_ops(&fw_syscore_ops);
+ unregister_pm_notifier(&fw_cache.pm_notify);
+#endif
class_unregister(&firmware_class);
}
EXPORT_SYMBOL(release_firmware);
EXPORT_SYMBOL(request_firmware);
EXPORT_SYMBOL(request_firmware_nowait);
+EXPORT_SYMBOL_GPL(cache_firmware);
+EXPORT_SYMBOL_GPL(uncache_firmware);
projects / karo-tx-linux.git / blobdiff